Your a vampire right? The same thing happens while wearing a Thieves guild hood or Linwe hood while being a vamp.
...wow, srsly? Lame. Oh well, at least that answers my question that there's nothing I can do to fix it. Anyone know if there are any plans on fixing it in future patches?
While I appreciate all the bugfixes to quests and little additions like extra killcams and mounted combat, I can't help but think Bethesda has to know about things like this, and permanent quest items that tend to pile up in your inventory, and wonder if they ever plan to do anything about it.